Machine for relief grinding tools



June 30, 1964 MERTENS 3,138,903

MACHINE FOR RELIEF GRINDING TOOLS Filed March 28, 1965 4 Sheets-Sheet l June 30, 1964 A. MERTENS 3,138,903

MACHINE FOR RELIEF GRINDING TOOLS Filed March 28, 1963 4 Sheets-Sheet 2 l I o, W l W M MEI I lfi' I m with HEIH1IIHIHI I 1 M iii1|'-" 7 E 1 1 J I I H I ,I' H I W i :1 Eff II a v gg! 5' E1 M ii w f 1 1 I r PT :TFE i i g Eiy'yl m'h kc RE H I W I I T (W 8 W m i I f V June 30, 1964 A. MERTENS 3,138,903

MACHINE FOR RELIEF GRINDING TOOLS Filed March 28, 1963 4 Sheets-Sheet 5 June 30, 1964 A. MERTENS 3,138,903

MACHINE FOR RELIEF GRINDING TOOLS Filed March 28, 1965 4 Sheets-Sheet 4 Fig. 4

United States Patent 3,138,903 MACHINE FOR RELIEF GRINDING TOOLS Andreas Mertens, Dusseldorf-Oberkassel, Germany, as-

signor to Rohde & Dorrenberg, Dusseldorf-Oberkassel,

Germany Filed Mar. 28, 1963, Ser. No. 268,791 Claims priority, application Germany Mar. 31, 1962 9 Claims. (Cl. 51-225) The present invention relates to a machine for relief grinding tools, especially stepped drills and stepped counter bores and similar tools.

With heretofore known relief grinding machines, customarily a relative movement in radial direction is carried out by the work piece and the grinding wheel. It is furthermore known, to adjust, for instance, the support for the grinding wheel at an incline with regard to the longitudinal direction of the tool in order to relief grind inclined cutting edges. It is also known in this connection to vary the magnitude of such movements. The heretofore known machines of the above mentioned type are, however, not able properly to relief grind irregular shapes.

It is, therefore, an object of the present invention to provide a machine for relief grinding, which will overcome the above mentioned drawbacks.

It is another object of this invention to provide a relief grinding machine for tools, which will be able to carry out relief grinding of any type without the necessity of providing special devices therefor.

These and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings, in which:

FIG. 1 diagrammatically represents a front view of a relief grinding machine according to the present invention.

FIG. 2 is a top view of the machine of FIG. 1 with the lid removed therefrom.

FIG. 3 is an end view of the machine as seen in the direction of the arrow A of FIG. 1.

FIG. 4 is a cross section along the line IV-IV of FIG. 2 but on a larger scale than the latter.

FIG. 5 is a diagram of the movement of the work piece.

General Arrangement The relief grinding machine according to the present invention, in which the work piece to be ground carries out a radial and/or an axial stroke, is characterized primarily in that the axial and the radial movements of the work piece may be made effective and ineffective individually and are operable and adjustable independently of each other as to magnitude and speed.

Thus, a round grinding operation can be carried out with such a machine when both the axial and radial movement have been made elfective. The machine is therefore suitable for all occurring relief grinding of tools without 3,138,993 Patented June 30, 1964 assure that the supporting roller properly engages the stroke discs, the head stock is spring biased in the direction toward said supporting roller. The drive shaft is connected to a shock absorber in order to cushion the re, turn stroke of the head stock. Mounted on the head stock perpendicular to the radial stroke disc is an additional stroke disc for the axial stroke of the work piece. This axial stroke disc is driven by the drive shaft through the intervention of a bevel gear pair and through an angle lever acts upon the spindle shaft and thereby upon the work piece, which, in this way, is adapted to carry out a reciprocatory axial movement. The angle lever is, for purposes of adjusting the axial stroke, connected to a follower of the spindle through an adjustable block. In this way, the axial strokes can be varied in an infinite manner. Between the drive shaft and the spindle there is arranged a change gear transmission in order to be able to adjust the rotation of the stroke disc in conformity With the number of the cutting edges of the work piece.

Structural Arrangement With reference to the drawing, it may be assumed that for instance the inclined cutting edges 1a of a countersink 1 as shown in FIG. 5 be relief ground. To this end, it is necessary that the work piece when rotating about its axis carry out a radial stroke R and an axial stroke A with regard to a stationary grinding wheel in order to obtain the resultant stroke H. By means of this resultant stroke, the cutting edge In Will be relief ground in an appropriate manner.

In order to subject the work piece 1 to the above mentioned movements, according to FIG. 1, the work piece 1 is clamped between center 2 of the tail stock 3 and center 4 of spindle 6 in head stock 5. Tail stock 3 is mounted on guiding means 7 connected to the head stock 5. The said guiding means 7 may be protected against dust and the like by means of bellows 8. The tail stock center 2 is resiliently journalled in the tail stock 3 so that the spring force acts in the direction toward center 4. Adjacent the tail stock 3 there is arranged the grinding wheel 9 which together with a driving motor therefor (not illustrated) is mounted on a column 10. This column 10 is adjustable as to height and is additionally rotatable about its vertical axis so that the grinding wheel may be adjusted in conformity with the requirements. In order to produce the various desired shapes of the work piece, the grinding wheel may be trued in a manner known per se by means of a diamond while the truing may be effected selectively through the intervention of a templet or in any other standard manner.

Spindle 6 is rotated by the main drive shaft 12 through the intervention of a change gear transmission 11. The outer end of shaft 12 has keyed thereto a worm wheel 13 which is driven by an electric motor 15 through the intervention of a worm 14. Connected to the other end of drive shaft 12 is a disc-like stroke control cam 16 resting against a roller 17. Roller 17 is carried by the carriage 19. The head stock is tiltable about shaft 18. Thus, if during a revolution of shaft 12, stroke control cam 16 performs a complete revolution while it engages roller 17, the head stock 5 will be oscillated once back and forth about 18. In order to obtain a proper engagement of cam 16 with roller 17, between head stock 5 and carriage 19 carrying saidhead stock there is provided a plurality of pressure springs (FIG. 4) which are arranged one behind the other when looking in longitudinal direction of the machine.

In order to cushion the return of the head stock, the drive shaft 12 is provided with a shock absorber 21 as for instance an oil shock absorber.

The adjustment of the entire device with regard to the grinding wheel 9 is effected on one hand by means of the longitudinal carriage 19 and hand wheel 22 (FIG. 1) and on the other hand by means of the transverse carriage 23 and hand wheel 24 for operating the latter.

In conformity with FIG. 1, a bevel gear 25 is keyed to drive shaft 12. This bevel gear 25 meshes with a bevel gear 26 keyed to a vertically arranged shaft 27. The upper end of shaft 27 has keyed thereto an exchangeable stroke control disc 28 which serves for controlling the axial stroke of spindle 6. This stroke control disc 28 acts upon an abutment pin 29 mounted on an angle lever 30 which is tiltable about a pivot 31 (FIG. 4). Angle lever 30 is provided with means for guiding a block 22 which is displaceable by means of a spindle 33. Spindle 33 may be rotated by means of a hand wheel 34 which drives shaft 37 through gears 35 and 36. Inasmuch as lever 30 carries out an oscillating movement, shaft 37 is provided with a universal joint 33 of any standard construction. Block 32 is provided with a stud 39 engaging a groove 49 of a slide member 41. This slide member 41 extends around the hollow spindle 6 of the machine. In order to prevent said slide member or block 41 from rotation, a stud .2 fixedly connected to the head stock 5 engages a groove 43 in slide block 41. At both sides of the slide block 41 there are provided axial or thrust anti-friction bearings which are non-displaceably mounted on spindle 6. If through stud 39, the slide block 41 is moved back and forth, through the intervention of said anti-friction bearings, also spindle 6 is displaced whereby an axial stroke is imparted upon the work piece 1. As will be evident from FIG. 2, the angle lever 30 is provided with a scale 44 in order to permit the adjustment of any desired stroke by means of spindle 33. Upon a ring 60. connected to the end of spindle 6 there acts a pressure spring 45 which urges spindle 6 toward the left with regard to FIG. 2 and thereby urges pin 29 into firm engagement with the stroke control disc 28.

If desired, work piece 1 instead of being clamped between two centers 2 and 4 may also be chucked at one end thereof. To this end, center 4 is in customary manner removed from the spindle, and may be replaced by any tool with a Morse taper shank. Advantageously, it is also possible in the hollow spindle to mount a further cone which is displaceable in order to be able favorably to chuck work pieces with a very long shank. Finally, it is also possible to equip the machine with collets, with cylindrical or with other conical bores.

It is, of course, to be understood that the present invention is, by no means, limited to the particular construction shown in the drawings but also comprises any modifications within the scope of the appended claims.

What I claim is:

1. A machine for relief grinding articles, especially tools, which includes: a head stock, a spindle rotatably journalled in said head stock, a drive shaft supported by said head stock and drivingly connected to said spindle, supporting means including pivot means having the axis thereof extending in the direction of the longitudinal extension of said spindle, first actuating means for effecting tilting movement of said head stock about said pivot means, said first actuating means comprising a first member rotatably connected to said drive shaft and also comprising a second member supported by said supporting means for cooperation with said first member, second actuating means for eifecting an axial movement of said spindle, said second actuating means including an actuating member drivingly connected to said drive shaft and also including an oscillatable member pivotally supported by said head stock and operable by said actuating member, and means operatively connecting said oscillatable member with said spindle for imparting a reciprocatory movement thereon.

2. An arrangement according to claim 1, in which said first member and said actuating member are individually detachable and exchangeable independently of each other.

3. A machine for relief grinding articles, especially tools, which includes: a head stock, a spindle rotatably journalled in said head stock, a drive shaft supported by said head stock and drivingly connected to said spindle, guiding means connected to and extending away from said head stock in the direction of the longitudinal extension of said spindle, a tail stock mounted on and guided by said guiding means for cooperation with said spindle and for receiving and holding a work piece therebetween, supporting means including pivot means having the axis thereof extending substantially parallel to the axis of said spindle for tiltably supporting said head stock and thereby also said guiding means and said tail stock thereon, first actuating means for effecting tilting movement of said head stock and said tail stock about said pivot means, said first actuating means comprising a first member rotatably connected to said drive shaft and also comprising a second member supported by said supporting means for cooperation with said first member, second actuating means for effecting an axial movement of said spindle, said second actuating means including an actuating member drivingly connected to said drive shaft and also including an oscillatable member pivotally supported by said head stock and operable by said actuating member, and means operatively connecting said oscillatable member with said spindle for imparting a reciprocatory movement thereon.

4. A machine for relief grinding articles, especially tools, which includes: a head stock, a spindle rotatably journalled in said head stock, a drive shaft supported by said head stock and drivingly connected to said spindle, supporting means including pivot means having the axis thereof extending in the direction of the longitudinal extension of said spindle, first actuating means for effecting tilting movement of said head stock about said pivot means, said first actuating means comprising cam means connected to said drive shaft for rotation therewith and also comprising roller means supported by said supporting means for cooperation with said cam means, second actuating means for effecting an axial movement of said spindle, said second actuating means including an actuating member drivingly connected to said drive shaft and also including an oscillatable member pivotally supported by said head stock and operable by said actuating member, and means operatively connecting said oscillatable member with said spindle for imparting a reciprocatory movement thereon.

5. An arrangement according to claim 4, which includes spring means continuously urging said cam means into engagement with said roller means.

6. An arrangement according to claim 1, which includes shock absorber means associated with said head stock for cushioning the tilting movement of the latter.

7. A machine for relief grinding articles, especially tools, which includes: a head stock, a spindle rotatably journalled in said head stock, a drive shaft supported by said head stock, first bevel gear means connected to said drive shaft for rotation therewith, a transmission shaft substantially perpendicular to said drive shaft and provided with second bevel gear means drivingly engaging said first bevel gear means, supporting means including pivot means having the axis thereof extending in the direction of the longitudinal extension of said spindle, first actuating means for effecting tilting movement of said head stock about said pivot means, said first actuating means comprising cam means connected to said drive shaft for rotation therewith and also comprising roller means supported by said supporting means for cooperation with said cam means, second actuating means for effecting an axial movement of said spindle, said second actuating means including additional cam means connected to said transmission shaft for rotation therewith and also including lever means pivotally supported by said head stock and operable by said additional cam means, and means operatively connecting said lever means with said spindle for imparting a reciprocatory movement thereon.

8. An arrangement according to claim 7, in which said lever means comprises a connecting member for connecting said lever means With said spindle and adjustable relative to said pivot means for varying the axial stroke of said spindle.

9. An arrangement according to claim 1, which includes change gear transmission means interposed between and drivingly interconnecting said drive shaft and said spindle.

References Cited in the file of this patent UNITED STATES PATENTS 2,351,502 Green June 13, 1944 2,420,572 Southwick et a1. May 13, 1947 2,447,138 Saari et al. Aug. 17, 1948 3,081,585 Boggis Mar. 19, 1963 FOREIGN PATENTS 451,345 Italy Sept. 7, 1949 

1. A MACHINE FOR RELIEF GRINDING ARTICLES, ESPECIALLY TOOLS, WHICH INCLUDES: A HEAD STOCK, A SPINDLE ROTATABLY JOURNALLED IN SAID HEAD STOCK, A DRIVE SHAFT SUPPORTED BY SAID HEAD STOCK AND DRIVINGLY CONNECTED TO SAID SPINDLE, SUPPORTING MEANS INCLUDING PIVOT MEANS HAVING THE AXIS THEREOF EXTENDING IN THE DIRECTION OF THE LONGITUDINAL EXTENSION OF SAID SPINDLE, FIRST ACTUATING MEANS FOR EFFECTING TILTING MOVEMENT OF SAID HEAD STOCK ABOUT SAID PIVOT MEANS, SAID FIRST ACTUATING MEANS COMPRISING A FIRST MEMBER ROTATABLY CONNECTED TO SAID DRIVE SHAFT AND ALSO COMPRISING A SECOND MEMBER SUPPORTED BY SAID SUPPORTING MEANS FOR COOPERATION WITH SAID FIRST MEMBER, SECOND ACTUATING MEANS FOR EFFECTING AN AXIAL MOVEMENT OF SAID SPINDLE, SAID SECOND ACTUATING MEANS INCLUDING AN ACTUATING MEMBER DRIVINGLY CONNECTED TO SAID DRIVE SHAFT AND ALSO INCLUDING AN OSCILLATABLE MEMBER PIVOTALLY SUPPORTED BY SAID HEAD STOCK AND OPERABLE BY SAID ACTUATING MEMBER, AND MEANS OPERATIVELY CONNECTING SAID OSCILLATABLE MEMBER WITH SAID SPINDLE FOR IMPARTING A RECIPROCATORY MOVEMENT THEREON. 